Some of the 305s of the mid 80s were real screamers.I had one in a 56 Chevy sedan,and it was a real runner and very economical to operate.Better known as high performance 305s.They were used in Camaros,Monte Carlos,and some Pontiacs right around 1984.Mine had a highrise Edelbrock manifold and 600CFM Edelbrock carb.and stock exhaust manifolds with dual exhaust.That car is stiil around and running just great,and is for sale for $35,000.